By enabling the dev console in Fallout 3, you can give yourself exactly the same kind of superuser game access that the developers have when they are working on the game. Here's an extensive list of console commands you can use to get all sorts of great stuff.

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(1) Part 1 of 3 - How to Use the console commands when playing Fallout 3, (2) Part 2 of 3 - How to Use the console commands when playing Fallout 3, (3) Part 3 of 3 - How to Use the console commands when playing Fallout 3